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    <title>Document</title>
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<script>
    // 把1-100之间所有能够被3和7同时整除的数找出来，计算累加和

    // 声明保存求和变量
    let sum = 0;
    for (let i = 1; i <= 100; i++) {
        if (i % 3 == 0 && i % 7 == 0)
            sum += i;
    }

    // 控制台打印
    console.log(sum);
</script>

</html>